A professor posed a hypothesis that there was no significant difference

A professor posed a hypothesis that there was no significant difference
between boys and girls on their soda consumption per day in an elementary school. He randomly sampled 25 boys and 25 girls. The mean soda consumption for boys was 40 oz per day and the standard deviation was 5. The mean soda consumption for girls was 30 oz per day and the standard deviation was 5. What is the standard error of the difference in means? (show work)

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